Parse and show multiple tags per word in Gysseling

[peterdekker]

Gysseling can have multiple tags per word, of the form:
VRB(type=main,finiteness=finite,tense=present,inflection=0)+PD(type=pers,other)
We would like to parse and show these.
Desired output would be this:
pos: VRB+PD type: main+pers finiteness:finite+undefined (of na ofzo voor not applicable) tense:present+undefined inflection: 0+undefined
Right now, they are misparsed.

I started work on this, but did not yet finish, on this branch: https://github.com/INL/clariah-fcs-endpoints/tree/multipletags